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Majindeite, Mg2Mo3O8, a new mineral from the Allende meteorite and a witness to post-crystallization oxidation of a Ca-Al-rich refractory inclusion

  • Chi Ma EMAIL logo and John R. Beckett
Published/Copyright: April 30, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 5

Abstract

Majindeite (IMA 2012-079), Mg2Mo3O8, is a new mineral, occurring as submicrometer-sized crystals with Ni-Fe and Ru-Os-Ir alloys, ± apatite and Nb-oxide. The observed assemblages are partially or wholly enclosed by MgAl2O4 spinel in a Type B1 Ca-Al-rich inclusion, ACM-2, from the Allende CV3 carbonaceous chondrite. The type majindeite has an empirical formula of (Mg1.57Fe0.43)Mo3.00O8, and a nolanite-type P63mc structure with a = 5.778 Å, c = 9.904 Å, V = 286.35 Å3, and Z = 2, leading to a calculated density of 5.54 g/cm3.

Majindeite likely formed during the subsolidus oxidation of Mo-rich precursor phase(s) included in Fe-Ni rich alloys in a system that was open to O, Mg, and Ca, which were derived externally and introduced via cracks, subgrain boundaries, and/or surfaces exposed at the exterior of the spinel. If magnetite existed in the phase assemblage, it was lost due to Fe volatilization prior to the formation of majindeite. The immediate precursor to majindeite was likely kamiokite. Majindeite formed during an oxidation event contemporaneous with or postdating the formation of grossular-rich veins in melilite.

Kamiokite, the Fe-rich analog of majindeite, also occurs in ACM-2 but only within phase assemblages that contain magnetite and which are entirely enclosed in melilite ± alteration products. Here, grossular-rich veins are not observed and the coexisting awaruites are more Fe-rich than those observed with majindeite. As with majindeite, the precursors for kamiokite grains were also likely to have been Mo-rich alloys, but the Mo-oxide remained magnetite-saturated throughout the alteration process and therefore remained Fe-rich.

Keywords: Majindeite; Mg2Mo3O8; new mineral; kamiokite group; Allende meteorite; CV3 carbonaceous chondrite; EBSD; Ca-Al-rich inclusions

Acknowledgments

SEM, EBSD, and EPMA analyses were carried out at the Caltech GPS Division Analytical Facility, which is supported, in part, by NSF Grants EAR-0318518 and DMR-0080065. J.R.B. acknowledges NASA grant NNG04GG14G. We thank Steven Simon, Makoto Kimura, and associate editor Rhian Jones for their constructive reviews.

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Received: 2015-5-4
Accepted: 2015-12-24
Published Online: 2016-4-30
Published in Print: 2016-5-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5399
Keywords for this article
Majindeite; Mg2Mo3O8; new mineral; kamiokite group; Allende meteorite; CV3 carbonaceous chondrite; EBSD; Ca-Al-rich inclusions

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  42. Thermodynamics of mixing in an isostructural solid solution: Simulation methodologies and application to the rutile-cassiterite system
  43. Research Article
  44. Compressibility of 2M1 muscovite-paragonite series minerals: A computational study to 6 GPa
  45. Research Article
  46. Joegoldsteinite: A new sulfide mineral (MnCr2S4) from the Social Circle IVA iron meteorite
  47. Research Article
  48. Oxygen isotope thermometry reveals high magmatic temperatures and short residence times in Yellowstone and other hot-dry rhyolites compared to cold-wet systems
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  50. The elastic tensor of monoclinic alkali feldspars
  51. Letter
  52. Ca neighbors from XANES spectroscopy: A tool to investigate structure, redox, and nucleation processes in silicate glasses, melts, and crystals
  53. Letter
  54. Coupled substitution of Fe3+ and H+ for Si in wadsleyite: A study by polarized infrared and Mössbauer spectroscopies and single-crystal X-ray diffraction
  55. Research Article
  56. New Mineral Names
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